Dickinson, 33, was arrested in March following a joint investigation by the Secret Service and the Saratoga Springs Police Department.

He pleaded guilty to attempted making a terroristic threat, a felony.

Dickinson also threatened President Barack Obama in the message and has yet to answer that charge in federal court.

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Dickinson faces one to three years in prison, he is scheduled to be sentenced Oct. 15.

When he appeared in court in March, Dickinson told reporters the situation was being "blown way out of proportion."

Dickinson's sentence will include orders barring him from all branches of the Saratoga Regional YMCA, the Saratoga Springs Public Library and Skidmore College -- all places he used public computers for illegal activity. He is also barred from going on the grounds of all private, public and parochial schools in Saratoga County.

"There have been so many of these violent school attacks and campus shootings," District Attorney James A. Murphy III said. "Fortunately, we're acting preventatively so that we don't end up like a Virginia Tech or a Texas A&M."

A call to the U.S. Attorney's Office in Albany, which is handling the federal case against Dickinson, was not returned by press time.